Add selectStream methods for large result sets

[simPod]

Summary

Adds streaming variants for SELECT queries:

• ClickHouseClient::selectStream()
• ClickHouseClient::selectStreamWithParams()

Both methods return the raw PSR-7 StreamInterface response body, so callers can incrementally read large result sets instead of forcing the client to materialize and decode the complete response in memory.

Implementation

• Reuses the existing SELECT request path and ClickHouse settings handling.
• Keeps the existing select() / selectWithParams() behavior unchanged.
• Leaves output decoding to callers, which lets them choose line-by-line, chunked, or format-specific streaming parsers.

Validation

• Added coverage for streamed SELECT responses, parameterized streamed SELECTs, and streamed SELECT settings.
• Verified locally with the SelectTest suite against ClickHouse.
• Exercised from a downstream application with a large aggregation response to confirm reduced memory usage.

[codecov]

Codecov Report

❌ Patch coverage is 86.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.41%. Comparing base (ddb1e57) to head (73797d6).
⚠️ Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Client/PsrClickHouseClient.php	86.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #323      +/-   ##
==========================================
- Coverage   94.49%   94.41%   -0.09%     
==========================================
  Files          42       42              
  Lines         709      734      +25     
==========================================
+ Hits          670      693      +23     
- Misses         39       41       +2     

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